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Paul Dagnelie
2adca179b6
When you are using large recordsizes in conjunction with raidz, with incompressible data, you can pretty reliably be making 21 MB allocations. Unfortunately, the fragmentation metric in ZFS considers any metaslabs with 16 MB free chunks completely unfragmented, so you can have a metaslab report 0% fragmented and be unable to satisfy an allocation. When using the segment-based metaslab weight, this is inconvenient; when using the space-based one, it can seriously degrade performance. We expand the fragmentation table to extend up to 512MB, and redefine the table size based on the actual table, rather than having a static define. We also tweak the one variable that depends on fragmentation directly. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Closes #16986
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.